Interaction between Filler and Polymeric Matrix in Nanocomposites: Magnetic Approach and Applications

In recent years, polymer nanocomposites produced by combining nanofillers and a polymeric matrix are emerging as interesting materials. Polymeric composites have a wide range of applications due to the outstanding and enhanced properties that are obtained thanks to the introduction of nanoparticles. Therefore, understanding the filler-matrix relationship is an important factor in the continued growth of this scientific area and the development of new materials with desired properties and specific applications. Due to their performance in response to a magnetic field magnetic nanocomposites represent an important class of functional nanocomposites. Due to their properties, magnetic nanocomposites have found numerous applications in biomedical applications such as drug delivery, theranostics, etc. This article aims to provide an overview of the filler-polymeric matrix relationship, with a special focus on magnetic nanocomposites and their potential applications in the biomedical field.

Research on the Approximate Establish Condition of the Scattering Center

According to the matrix relationship between the induced source and an incident wave in the electromagnetic scattering theory, the formula connecting the scattering center parameters and the matrix element are deducted, and matrix diagonalization and aggregation approximation of the induced source and the incident wave is pointed as the main establish condition of scattering center. Based on the conclusion, the scattering center distribution of a metal plate is given; the RCS error of the scattering center approximate model is analyzed. It is demonstrated that the approximate establish condition of the scattering center is valid.

Maile-Ann Company: A Matrix Approach To Reciprocated Support Department Cost Allocations

The reciprocal method for allocating support department costs has been shown to be better than the direct and step-down methods. In addition, a matrix approach for the reciprocal method has been presented often in academic journals. Yet, the instructional use of spreadsheet matrix functions for reciprocal cost allocations has been limited as many authors continue to present two-department simultaneous equations solved by algebraic substitutions. The Maile-Ann Company presents an intuitive matrix approach to allocating reciprocated costs of many support departments. The case converts commonly used algebraic expressions of support department reciprocated costs into an equivalent matrix relationship. Spreadsheet matrix functions compute each support department’s reciprocated costs and allocate them to user departments.

Maintenance of beta-cell function and survival following islet isolation requires re-establishment of the islet-matrix relationship

Islet transplantation is associated with a high rate of early graft failure, a problem that remains poorly understood. It is probable that the destruction of the islet microenvironment and loss of tropic support that occur during isolation lead to compromised survival. The purpose of this study was to determine the role of matrix-integrin interactions on beta-cell survival and function following islet isolation. Canine islets were obtained by conventional methods. Immediately after isolation, the peri-insular basement membrane (BM) was absent. The ability of islets maintained in suspension culture to attach to a collagen matrix declined progressively over 6 days. Attachment could be blocked by an arginine-glycine-aspartate (RGD) motif-presenting synthetic peptide, thereby implicating an integrin-mediated process. Characterization of cell surface integrins by immunocytochemistry (ICC) demonstrated that the expression of integrins alpha3, alpha5 and alphaV diminished during the culture period. This change was coincident with both a decrease in beta-cell function (proinsulin gene expression, islet insulin content and stimulated insulin release) and a rise in beta-cell death from apoptosis, as determined by in situ cell death detection (TUNEL) assay. These adverse events were prevented or delayed by exposure of islets to matrix proteins. In conclusion, routine islet isolation disrupts the cell-matrix relationship leading to a variety of structural and functional abnormalities, including apoptotic cell death. These alterations can be diminished by restoration of a culture microenvironment that includes matrix proteins.